You want to unit test a microservice method that calls two other services: a user service and an inventory service. Which approach best ensures your unit test is reliable and fast?

hard📝 Trade-off Q15 of 15

Microservices - Testing Microservices

ASkip testing this method because it depends on other services

BCall both real services during the test to check integration

CMock both user and inventory service calls with fixed responses

DTest only the user service call and ignore inventory service

Step-by-Step Solution

Solution:

Step 1: Understand unit test isolation
Unit tests should isolate the method by mocking external service calls to avoid flakiness and slowness.
Step 2: Apply mocks to all external dependencies
Mocking both user and inventory service calls ensures the test is reliable and fast without real network calls.
Final Answer:
Mock both user and inventory service calls with fixed responses -> Option C
Quick Check:
Mock all external calls for reliable, fast unit tests [OK]

Quick Trick: Mock all external services for isolated unit tests [OK]

Common Mistakes:

Calling real services in unit tests
Skipping tests due to dependencies
Partially mocking dependencies leading to flaky tests

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More Microservices Quizzes

You want to unit test a microservice method that calls two other services: a user service and an inventory service. Which approach best ensures your unit test is reliable and fast?

Step 1: Understand unit test isolation

Step 2: Apply mocks to all external dependencies

Final Answer:

Quick Check:

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